Electric Kid four wheeler battery

nokiasixteth

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I have the 12 volt 12 ah kids four wheeler from wal mart . The thing runs for about 1min 20 seconds and its dead. Soo. To get some practice in i am going to swap from the old heavy battery to some of the cells from ebay

http://www.ebay.com/itm/NEW-LG-36V-...d=172660442407&_trksid=p2047675.c100005.m1851

Obviously will have to take them apart such to change them into 12 volt. The original battery compartment is 4and a half inches wide 6 inches long and 4 inches deep . The 18650 cells are all close to the same size avg right . I am trying to see how i will need to configure my cells.
 
Depending on what the electric motor can handle, you could possibly be able to use 4s configuration. If it can handle 14v without issues, use 4s. If you find it's not supposed to go over 13, then 3s would be needed. Then just pack as many in parallel as possible to fit the space.

To get the specs on the motor, you should be able to find some model numbers on the electric motor itself. Then do a google on it and hopefully you can get a spec sheet on it.
 
I done a quick 20 min search online . It looks like theres not a lot of info on the motor. I went outside to see if i could easily see the motor and as i figured i couldnt see it easily . prob would have to take it all apart I found a site selling them that said due to the face people insisted on upping voltage there was no warraty so i guess i will play it safe and keep to the 12 volt setup it has right now just fill it up with 18650s 3s

00968-2938 is the only part number i found online.
 
Ive done 4s no problem as 99% of those motors are generic brushed DC motors and can handle up to 15V
 
Yeah, I personally don't think 1.5 - 2V will make that big of difference. For one, it's not going to be needed to crank out a whole lot of constant torque. And another, it's not like it's gonna run for hours on end. (the kid gets tired, or the batteries die ;) )
 
How many cells did you use with yours . Im a super newb to this stuff. But at least i can solder had to learn from my drones motors needing resoldering


nokiasixteth said:
I done a quick 20 min search online . It looks like theres not a lot of info on the motor. I went outside to see if i could easily see the motor and as i figured i couldnt see it easily . prob would have to take it all apart I found a site selling them that said due to the face people insisted on upping voltage there was no warraty so i guess i will play it safe and keep to the 12 volt setup it has right now just fill it up with 18650s 3s

00968-2938 is the only part number i found online.

Korishan said:
Yeah, I personally don't think 1.5 - 2V will make that big of difference. For one, it's not going to be needed to crank out a whole lot of constant torque. And another, it's not like it's gonna run for hours on end. (the kid gets tired, or the batteries die ;) )

I dont think that kid ever gets tired . Right now anything would be better that the ragedy battery thats in it . I figured what a good way to start and get my hands on it at least something i can get some solid numbers on so when i get to the hardcore house stuff i dont have to guess and wonder if i add this i maybe will get that.
 
Any of you guroos that know the sizes of this stuff know about how many i can fit in the compartment . The original battery compartment is 4and a half inches wide 6 inches long and 4 inches deep obviously need to have a little room in there. Looks like there about .95 inches around and 2.6 inches long . Looks like i can put 8 cells on the bottom and probably get 4 stacks of 8.
 
Depends on what type of pack you build. Are you going to hot glue the cells together, or are you going to use those plastic holders, or something different all together? If you hot glue, then you can stagger the cells so they fit tightly together and maybe get more in there.

Also, i would recommend using the high drain cells instead of the laptop cells. That is, the cells that come from cordless tools. You may not have as much run time with them, but you won't have to worry about them overheating on you, or rather, under the kid while they are using it. Just a thought.
 
Korishan said:
Depends on what type of pack you build. Are you going to hot glue the cells together, or are you going to use those plastic holders, or something different all together? If you hot glue, then you can stagger the cells so they fit tightly together and maybe get more in there.

Also, i would recommend using the high drain cells instead of the laptop cells. That is, the cells that come from cordless tools. You may not have as much run time with them, but you won't have to worry about them overheating on you, or rather, under the kid while they are using it. Just a thought.


I will probably just 3d print me some holders that way if a cell ever does die i can replace it. Glue would prob be easier with more . But a few hours of runtime on it is plenty .I was thinking of the ones that i posted on the first the lg 36 volt taking two or 3 apart and making a battery . Is there some you are seeing that is better ?
 
Just really any cells that are rated for like 10C or higher. That will give you best/safest pack for that kind of load (the electric motor AND the kid ;) )
If a cell can handle 10Amps or higher discharge, that would be good use. Just need to make sure you check the cell datasheets to verify.
 
This dude went into the nitty gritty of the pack.

Looks like nominal charge per cell is 2150
nominal voltage is 3.65 v
constant current is 1075ma
contant current 4.2 v
end condition(cutoff) is 2.75 ) whats that ?????
max charge 4.2 V
max discharge current 10A
 
End condition(cutoff) is when the bms will actually shut down power going out from the cells. Keeps them from being depleted too far. 40+mins is a loooong video review on these. Wow
 
Every day i learn something is a good day.
Yeah . That guy had a lotta time to spare. Ordering 3 packs of these saturday
 
This is how my pack for my 4wheeler looks like to the kids. Its 24V though:
 
I also 18650fied a 24V scooter, used 7s5p to make it even a little faster :D . But I also changed the speed controller and added a 20A bms (motor has 500W, looks the same as in your quad video, Daniel) to the pack for more safety. And I used cells from an ebike (3500mAh) because of the higher discharge rate. Now it runs like hell for more than 2 hours... :cool:

Have sun and always wear a helmet ;)
 
That may be a project for the future . For now i just want extended range . Speed doesnt really matter . (yet. ) I do plan to build an electric motorcycle for my self though to go with the bike collection. But thats another day and lot more dollars .
 
What battery protection are you guys using? I'm looking for something that will cut output at 3.2v or thereabouts.
 
No protection on my pack more than a LOUD beeper for rc. I have no built in BMS since i charge it with a RC charger.
 
I use a cheap bms from China, cutoff is around 2.4V, as far as I remember... bought it from Banggood...
 
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